B1795

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1795: Occupant Classification ECU Malfunction

DTC B1795 - Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
Troubleshoot DTC B1771 first when the DTCs B1771 and B1795 are output simultaneously.





HINT: When DTC B1150/23 is detected as a result of troubleshooting for Airbag System, check the DTCs stored in the occupant classification ECU. When DTC B1795 is output, perform troubleshooting for the DTC.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(b) Check for DTCs .
Result:
A
DTCs B1771 and B1795 are output.
B
DTC B1795 is output.
HINT: Codes other than DTCs B1771 and B1795 may be output at this time, but they are not related to this check.

A -- GO TO DTC B1771
B -- Continue to next step.
2. CHECK FUSE
(a) Measure the resistance of the ECU-B fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK WIRE HARNESS (SOURCE VOLTAGE)





(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connector from the occupant classification ECU.
(d) Connect the negative (-) terminal cable to the battery.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(g) Turn the ignition switch to the LOCK position.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
4. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU .
NEXT -- Continue to next step.
5. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the intelligent tester, perform "zero point calibration" .
OK:
"COMPLETED" is displayed.
NEXT -- Continue to next step.
6. PERFORM SENSITIVITY CHECK
(a) Using the intelligent tester, perform "sensitivity check" .
Standard values:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END